If you notice the first chord (root minor) has the 'A' string playing open. But the key is G minor!
So they have tuned it down 2 steps, and I believe they have done that on every string.
Can't be 100% about ALL the strings being down tuned because I don't have a guitar to hand, But the key is G minor, and from the listening the chords sound to me like:
G minor (2 bars)
E Flat major 7th (by simply changing the bass note to E Flat) (1 bar)
F major sus4th (1 bar)
Hope that helps
Nathaniel